Resolvent Expansions at All Spectral Thresholds for Three-Dimensional Discrete Schrödinger Operators
Year: 2026
Type: preprint
Abstract: This paper studies resolvent expansions at all four spectral thresholds for the discrete Schrödinger operator $H=-Δ+V $ on $\Z^3$, where $Δ$ denotes the discrete Laplacian on $\mathbb{Z}^3$ and $V(n)$ is a real-valued decaying potential of $\mathbb{Z}^3$. At the thresholds 0, 4, 8, and 12, we first give a complete classification of the threshold types and derive the corresponding resolvent expansions in weighted $\ell^2$-spaces, including the non-generic cases of resonances and eigenvalues. As a result, we establish the Jensen-Kato type time-decay estimates of the evolution $e^{itH} P_{ac}(H)$ to discrete Schrödinger equations with thresholds singularities on $\Z^3$, with decay $O(t^{-3/2})$ when all thresholds are regular and $O(t^{-1/2})$ otherwise. These results provide a three-dimensional lattice analogue of the Jensen--Kato classical analysis at zero energy threshold on $\mathbb{R}^3$.
Source: arXiv (Cornell University)
Authors: Chen, Yanhong, Huang, Sisi, Yao, Xiaohua
Language: English
Subfield: Mathematical Physics
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
Award: G8054159703
OpenAlex ID: W7222280940